Rival groups of pro-Brexit and pro-EU demonstrators are rallying outside Britain's Parliament ahead of Tuesday's historic vote on a divorce deal with the European Union.
Protesters seeking a new referendum on Britain's membership in the bloc are waving blue-and-yellow EU flags.
Others, who want the U.K. to make a clean break with the EU, are brandishing placards declaring "leave means leave." A few are holding signs declaring their opponents "traitors."
Britain voted by 52 percent to 48 percent in 2016 in favor of leaving the EU, and the country remains deeply divided over its relationship with its European neighbors.
Some pro-EU legislators have complained of harassment by a group of militant Brexiteers, some of whom have adopted the yellow vests of France's populist street protest movement.